In clinical practice male urinary catheters are usually inserted to a depth of around 15 to 20 centimeters, the key being to ensure that the catheter balloon enters the bladder and that the urine flows out smoothly. A male catheter is a tool used in catheterization, often for difficult urination, urinary retention, and routine catheterization prior to surgery. In men, the urethra is longer and more curved than in women. Therefore, if a catheter needs to be inserted in a man, it is usually inserted at a deeper depth, usually around 15 to 20 centimeters. When inserted to this depth, you can observe whether there is any urine discharge, if so you can go deeper by about 2 centimeters, and then inject saline from the inlet, pull back with a sense of obstruction. If there is no urine discharge, you should continue to insert the catheter until the urine flows out smoothly. The operation of placing a urinary catheter must be carried out under the operation of a medical professional and strictly observe the aseptic operation to avoid complications such as urinary tract infection.